I must identify a capacitor value on the crossover of my loudspeakers. What is likely the value of a "475K/250V" metalyzed polyester capacitor?
Some information:
I sent an email to the Manufacturer (Expotus) some time ago but their customer support service couldn't clarify my doubt. I was only told that it was possibly a 0,47uF capacitor and the third number is referred to its tolerance (5%). If it's true, the correlate capacitance to the paralleled capacitors is around 2uF. Do 3,3uF and 2uF values make any sense for a first order crossover?
If someone can help me with this identification I'd appreciate. I'd like to avoid to take the capacitor off as all parts are fixed with hot glue. I have experience with solder but I'm thinking of having the crossover modification done by a more skillful technician. Otherwise, I'll have to purchase a hot glue pistol and other appropriate tools. I'm afraid of making a mess on the crossovers when melting the silicon glue.
Some information:
- A 1,5K/100V capacitor (I guess it's a 1,5uF one) is paralleled to the above mentioned capacitor.
- There's also a 3,3K /100V capacitor (I guess it's a 3,3uF one).
- The crossover type is first order
I sent an email to the Manufacturer (Expotus) some time ago but their customer support service couldn't clarify my doubt. I was only told that it was possibly a 0,47uF capacitor and the third number is referred to its tolerance (5%). If it's true, the correlate capacitance to the paralleled capacitors is around 2uF. Do 3,3uF and 2uF values make any sense for a first order crossover?
If someone can help me with this identification I'd appreciate. I'd like to avoid to take the capacitor off as all parts are fixed with hot glue. I have experience with solder but I'm thinking of having the crossover modification done by a more skillful technician. Otherwise, I'll have to purchase a hot glue pistol and other appropriate tools. I'm afraid of making a mess on the crossovers when melting the silicon glue.
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Usually it is like this:
101=100pf
102=1nf
103=10nf
104=100nf
105=1uf
106=10uf
107=100uf......
475=4.7uf.
If still in absolute doubt, and you have a function generator and a meter or scope, you can place a resistor in series and determine the value by the voltage drop. Figure the Z of the capacitor in the voltage divider, Z=1/(2pi*F*C). Solve for C.
101=100pf
102=1nf
103=10nf
104=100nf
105=1uf
106=10uf
107=100uf......
475=4.7uf.
If still in absolute doubt, and you have a function generator and a meter or scope, you can place a resistor in series and determine the value by the voltage drop. Figure the Z of the capacitor in the voltage divider, Z=1/(2pi*F*C). Solve for C.
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A three-digit number on a capacitor is usually two significant digits followed by the number of zeroes in picofarads. That's 4700000 or 4,700,000pF or 4.7uF. I vaguely recall that the letter k indicates tolerance, but I don't recall exactly what tolerance corresponds to k.
4.7uF in parallel with 1.5uF would be 6.2uF. This is a "reasonable" value for a crossover, but it's hard to tell how this would relate to the 3.3uF value without seeing the complete crossover schematic.
4.7uF in parallel with 1.5uF would be 6.2uF. This is a "reasonable" value for a crossover, but it's hard to tell how this would relate to the 3.3uF value without seeing the complete crossover schematic.
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